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<!DOCTYPE html> <html> <body> <h1>The Document Object</h1> <h2>The querySelector() Method</h2> <h3>Add a background color to the first p element:</h3> <p>This is a p element.</p> <p>This is a p element.</p> <script> document.querySelector("p").style.backgroundColor = "red"; </script> </body> </html>
